Critic’s Notebook: ‘Doomsday Preppers’ and ‘Doomsday Bunkers,’ TV Reality Shows

Critic’s Notebook: ‘Doomsday Preppers’ and ‘Doomsday Bunkers,’ TV Reality Shows: Two new reality shows, “Doomsday Preppers” on the National Geographic Channel and “Doomsday Bunkers” on Discovery, feature people preparing for some kind of apocalypse.